Lock



FIG. 1 is a perspective view of a lock showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a rear elevational view thereof.

The broken lines, which define the bounds of the claimed design form no part thereof.

The portions of the Figures shown in phantom lines are not part of the claimed design but are for illustration only. 

The ornamental design for a lock, as shown and described. 